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Fig. 4. Comparison of basal regions of wild-type and knuckles siliques grown at 25°C. Whole green wild-type and knu siliques are shown far left in vertical orientation. (A,B) Details of the basal portions of two wild-type siliques, and C and D show details of two knu siliques in plants grown at 25°C, in horizontal orientation. knu siliques show exaggerated nectary tissue relative to wild-type. The gynophore is extended in D and the green silique has three valves. Scale bars: 500 µm in A-D. g, gynophore; n, nectaries; pd, pedicel; r, replum; v, valve.